<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>



<script>

    //规则：单词字符：6~12

    var reg = /^\w{6,12}$/;

    var str = "abcaaa";

    let flag = reg.test(str);
    alert(flag);
</script>
</body>
</html>